<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        ul{
            margin: 0;
        }
        #app{
            height: 150vh;
        }
        #body{
            height: 400px;
            margin: 0 20px;
        }
        #body .content li{
            list-style: none;
            height: 100px;
            background-color: #cccccc;
            margin-bottom: 20px;
        }
    </style>
</head>
<body>
    <div id="app">
        <div id="body">
            <div class="content">
                <ul>
                    <li>1111</li>
                    <li>2222</li>
                    <li>3333</li>
                    <li>4444</li>
                    <li>5555</li>
                    <li>6666</li>
                </ul>
            </div>
        </div>
    </div>
    <script>
        
    </script>
</body>
</html>